Rhanicko/Gargantua-Blackhole — reverse-engineered prompt

Build me a simple one page website called Gargantua Blackhole. I want it to feel like a dramatic space page, with a dark background, a big glowing black hole visual in the center, and a short intro explaining what Gargantua is in plain language.

Keep it lightweight so it can run from a single HTML file if possible. Add nice styling, subtle animation, and make it look good on both desktop and phone. It should feel cinematic, not like a boring school page. Include a small section with a few quick facts about black holes, and maybe a button that scrolls the user down to learn more.

Please make the page polished enough that I can open index.html in a browser and it just works.